The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 1996
Filed:
Feb. 24, 1995
Kosho Miura, Kanagawa-ken, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A finder device using a pentagonal mirror is constructed so that it does not experience clouding, condensation, or oxidation. The finder device (1) comprises a first reflection component (4) having at least two reflective surfaces (6a and 6b) which intersect at substantially right angles. The surfaces reflect the light which passes through at least one of the focus plate (2) and the condenser lens (3) of a camera. A second reflection component (8) reflects the light rays reflected to it by the first reflection component (4) to an eyepiece optical system (11). The space formed between the first and second reflection components (4 and 8) and either the condenser lens (3) or the focus plate (2) or both is filled with an inactive gas. This inactive gas helps prevent clouding, condensation, or oxidation.